Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS4026387 A
Publication typeGrant
Application numberUS 05/648,467
Publication dateMay 31, 1977
Filing dateJan 12, 1976
Priority dateJan 12, 1976
Publication number05648467, 648467, US 4026387 A, US 4026387A, US-A-4026387, US4026387 A, US4026387A
InventorsVasco O. Abreu
Original AssigneeAbreu Vasco O
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Wheelchair lift
US 4026387 A
A lift for raising or lowering a wheelchair into or from a vehicle, such as a trailer or bus, which comprises a platform pivoted at a single point or location for swinging through about 90 from beneath the trailer to a position at right angles thereto. The pivot is on the end of a shaft which may be raised and lowered so that the lift may be on the ground to receive a wheelchair and then lifted to a height of the level of the doorsill of the trailer for the wheelchair to be wheeled into the vehicle. The vehicle need be changed in no way, but the lift will be just added thereto.
Previous page
Next page
I claim:
1. A lift device attached to a vehicle having an access opening comprising a jack having a shaft reciprocably movable in generally an axial direction, means mounting said jack on the outside of the vehicle adjacent said opening with the axis of said shaft generally vertical and outside of the vehicle, means to move said shaft in either upward or downward axial direction, a platform of a size to receive a wheelchair pivotally mounted solely at the end portion of said shaft for swinging about the axis of said shaft through at least 90 from a stored position beneath said vehicle to an operating position at generally right angles to and outside the vehicle.
2. A lift as in claim 1 wherein a ramp is hinged to the edge of said platform distant from said pivotal mounting to fold over said platform.
3. A lift as in claim 1 wherein a locking means comprising a member on said platform and a member mounted on the vehicle are positioned to engage to hold the platform against swinging beyond an operating position.
4. A lift as in claim 1 wherein the platform when in stored position may be raised to engage the underside of the vehicle with sufficient friction to hold the platform in stored position.
5. A lift as in claim 1 wherein a torsion bar extends beneath the platform from a location adjacent its pivot diagonally to its far edge.

Usually wheelchair lifts for vehicles have been arranged so that the lift houses within the vehicle and takes up space. The lift is usually supported at two locations for swinging upwardly into the vehicle. Often the vehicle upon which it is mounted has to be altered in some way in order to receive the lift.


A platform which is raised and lowered is mounted adjacent the side opening in the vehicle, which opening is usually closed by a door. This platform is on the outside of the vehicle on a single pivot at the end of a vetical shaft which may be raised and lowered by a screw operated electric jack. When in partly lowered position, the platform may be swung beneath the vehicle and stored out of the way while when it is to be used the platform is swung at generally right angles to the vehicle in front of the door opening into the vehicle and raised to the height of the doorsill of the trailer so that a wheelchair may be rolled off of the platform into the trailer. A ramp may be provided from the platform to the ground which ramp is folded over the platform when not needed for use. When the platform is stored beneath the vehicle the jack may raise the platform in this stored position against the bottom of the vehicle to provide sufficient friction so that the platform will remain in stored position. When swung to its operating position, there is a bracket which will engage some part attached to the bottom of the vehicle so that the platform will not swing beyond a position at right angles to the vehicle when the wheelchair is rolled thereon.


FIG. 1 is a perspective view showing the platform mounted adjacent the door of a trailer vehicle fragmentally shown;

FIG. 2 is an elevation on a larger scale of the platform showing it in full lines in raised position and in dotted lines in lowered position;

FIG. 3 is a fragmental sectional view of the upper part of the lifting and lowering jack;

FIG. 4 is a fragmental sectional view of the lower part of the jack and its attachment to the platform;

FIG. 5 is a fragmental view of the jack mounting bracket;

FIG. 6 is a plan view of the platform in operating position;

FIG. 7 is a plan view of the platform in stored position beneath the trailer;

FIG. 8 is a fragmental elevational view of the locking of the platform in working position.


With reference to the drawings 10 designates the side wall of the trailer or vehicle with which this platform is to be assembled while 11 designates the door for the opening 11' in the side of the trailer which door is shown in open position for the use of the platform to be here described. The door frame is designated 40. The mounting for the platform comprises a plate 12 which is bolted along the side of the door opening and upon this plate there are hanger brackets 14 which mount a cylindrical housing 15 which contains a threaded shaft 16 which may be rotated to raise and lower an internally threaded shaft 17 by rotation of a two-way electric motor 18 having a rocker switch 19 for control. The motor is of a reversible type so that when the switch is thrown in one position the screw mechanism is so rotated as to raise the shaft 17 within the cylinder 15 and when rocked in the other direction it will lower the shaft 17 within the cylinder 15. The lower end of the shaft 17 is reduced as at 21.

A platform 25 is of generally rectangular shape having a ramp 26 hinged as at 27 along a front edge thereof which ramp may be folded into overlapping position on the platform as shown in FIG. 2. This platform has a side edge 28 and upon this side edge near the back edge 29 there is secured by bolts 30' a bracket 30. This bracket mounts a pair of ball bearings 31 and 32. A spacer ring 33 between these bearings receives the lower reduced portion 21 of the shaft 17 and is fixed thereto and is located between the two ball bearings which are fixed in the bracket 30 by shoulders 34 so as to hang the platform on this end of the shaft for swingably mounting the platform so that it may pivot at least 90 about the axis of shaft 16 or 17. When this platform is in intermediate position from raised to lowered, it may be swung about this pivotal mounting to a location beneath the vehicle as shown in FIG. 7 and then raised to be in frictional contact with the bottom of the vehicle so that it will be held there by this frictional contact and will not swing out. However, by lowering the platform slightly from this frictional engagement, the platform may be swung outwardly to be about at right angles to the vehicle as in FIGS. 1, 2, 6 and then raised so that the near edge 29 will be at substantially the level of the lower edge of the threshhold of the door opening 11'. At the time that the platform is raised into this operating position there is an angle iron 35 mounted on the edge of the platform which receives a dog 36 extending downwardly from the body of the trailer to lock the platform in the outwardly projecting or operating position so that when a wheelchair is rolled out of the door opening 11' of the trailer onto the platform, the platform will not pivot around the shaft on which it is mounted. The wheelchair may be operated through means of the ramp 26 with the platform in either full lowered position or in raised position. The vertical position of the platform is under control of the occupant of the wheelchair when on the platform 25 who will then be adjacent switch 19.

A torsion bar 37 (FIG. 6) extends from a location adjacent the bracket 30 diagonally across the platform to a point adjacent the corner 38 so as to provide additional support for the platform when weight is placed upon it.

From the above it will be apparent that I have made no changes in the trailer for the mounting of the wheelchair lift but have merely attached the parts of the wheelchair lift to the trailer on the outer surface thereof. By this arrangement the housing of the platform and its associated parts do not enter the trailer to take up any room but store conveniently in secure position beneath the trailer. All raising and lowering of the platform is by an electric jack at a convenient location by the wheelchair occupant when located on platform 25.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US758493 *Dec 8, 1903Apr 26, 1904Edward Randall AbbeyCar-loading apparatus.
US1457639 *Sep 27, 1919Jun 5, 1923Straight Merton TTruck for handling hollow blocks and tile
US3291261 *Sep 22, 1965Dec 13, 1966Robb Morrison LTruck elevator
US3515294 *Mar 19, 1968Jun 2, 1970Leonard B SouthwardApparatus for use in enabling immobile persons and invalids to be placed in or removed from a vehicle
US3516559 *Feb 15, 1968Jun 23, 1970Eldon G WalterWheelchair handling apparatus
US3651965 *May 1, 1970Mar 28, 1972Clover Ind IncWheel chair ramp for automotive vehicles
US3661228 *Dec 23, 1969May 9, 1972Glasser Jay LWheel chair lift
US3710962 *Feb 11, 1971Jan 16, 1973J FowlerLift device
US3737009 *Nov 1, 1971Jun 5, 1973J StoddardWheel chair lift
US3893576 *Sep 17, 1973Jul 8, 1975Chris D CasadyRotating platform elevator
US3912048 *Jul 26, 1974Oct 14, 1975Gen Motors CorpWheelchair elevator for motor coach
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4071152 *Dec 13, 1976Jan 31, 1978County Of Santa Clara, State Of CaliforniaWheelchair lift for public transportation vehicle
US4140230 *May 12, 1977Feb 20, 1979Pearson Marvin RPowered loading platform
US4252491 *Mar 30, 1979Feb 24, 1981Jelco Service Co., Inc.Material lift platform
US4298305 *Nov 22, 1978Nov 3, 1981Columbia Machine, Inc.Method and apparatus for transferring loads
US4306634 *Aug 8, 1979Dec 22, 1981Sangster George GLift assembly
US4324317 *Jan 28, 1980Apr 13, 1982Winkelblech Dean RElevator device
US4353436 *Apr 16, 1980Oct 12, 1982Ricon Corp.Manual wheelchair lift
US4466771 *May 29, 1981Aug 21, 1984Thorley Graham RWheelchair lift
US4551060 *Nov 9, 1982Nov 5, 1985Societe Anonyme Des Usines ChaussonDevice for raising various loads, particularly trolleys for handicapped persons, on vehicles
US4741660 *Sep 9, 1985May 3, 1988Kent Jimmy JApparatus for lifting and transporting powered wheelchairs
US4915573 *Sep 6, 1988Apr 10, 1990Wapner Frank JStair lift
US5110252 *May 24, 1990May 5, 1992Hogan Mfg., Inc.Wheelchair lift for transit vehicles having elevated passenger compartment floor
US5160236 *Jul 31, 1991Nov 3, 1992Redding Edward MRetractable van side door ramp
US5391041 *Jan 6, 1993Feb 21, 1995New Flyer Industries LimitedHydraulically operated bus ramp mechanism
US5456335 *Aug 18, 1994Oct 10, 1995Kinsey; James E.Patient lifting device
US5755309 *Feb 12, 1996May 26, 1998Retrofit Lifts, Inc.Vehicle doorway lift
US6179546Aug 27, 1997Jan 30, 2001Rc Sales And ManufacturingExternally stowed wheelchair lift
US7073867 *Mar 4, 2004Jul 11, 2006Paul HuenkeCargo bucket system
US7274980Jan 24, 2005Sep 25, 2007Intermotive, Inc.Intelligent lift interlock system
US7546902 *Nov 6, 2006Jun 16, 2009Larry Victor SchwertnerPersonnel lift apparatus
US7744142Jun 9, 2008Jun 29, 2010Lippert Components, Inc.Strap bed lift
US8038193May 13, 2010Oct 18, 2011Lippert Components, Inc.Strap bed lift
US8087496Mar 3, 2009Jan 3, 2012Taylor Daniel ERamp system
US20050194831 *Mar 4, 2004Sep 8, 2005Paul HuenkeCargo bucket system
US20070107990 *Nov 6, 2006May 17, 2007Schwertner Larry VPersonnel lift apparatus
US20080238119 *Jun 9, 2008Oct 2, 2008Lippert Components, Inc.Strap bed lift
US20100219660 *Sep 2, 2010Lippert Components, Inc.Strap Bed Lift
WO1994004391A1 *Aug 21, 1992Mar 3, 1994Edward M ReddingRetractable van side door ramp
WO1997047552A1 *Jun 10, 1997Dec 18, 1997Outokummun Seudun TeollisuuskyMinihoist
U.S. Classification414/541, 187/200, 414/545, 414/921
International ClassificationA61G3/06, B60P1/46
Cooperative ClassificationY10S414/134, A61G3/062, A61G2003/067, A61G2220/16, A61G3/06
European ClassificationA61G3/06